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Facts

EDWARDS, Circuit Judge. This is an interlocutory appeal from a District Judge's denial of a motion to dismiss filed by three corporations which are defendants-appellants herein. The District Court certified that the appeal presented a controlling issue of law and this court granted leave to appeal under 28 U.S.C. § 1292(b) (1970). Appellants' motion to dismiss was based upon the contention that each plaintiff individually had failed to meet the requirement of a $10,000 amount in controversy for diversity jurisdiction set forth in 28 U.S.C. § 1332 (1970). The facts in this matter, as alleged in the pleadings, are somewhat unique. Thirty-seven persons, members of thirteen families residing near LaSalle, Ontario, Canada, have filed a complaint against three corporations which operate seven plants in the United States immediately across the Detroit River from Canada. Plaintiffs claim that pollutants emitted by plants of defendants are noxious in character and that their discharge in the ambient air violates various municipal and state ordinances and laws. They assert that the discharges represent a nuisance and that the pollutants are carried by air currents onto their premises in Canada, thereby damaging their persons and property. Each plaintiff individually claims damages ranging from $11,000 to $35,000 from all three corporate defendants jointly and severally. There is, however, no assertion of joint action or conspiracy on the part of defendants. Additionally, plaintiffs jointly seek $1,000,000 from each defendant, presumably as exemplary or punitive damages, because the nuisance complained of was "wilful and wanton." This action was originally brought as a class action under Rule 23(b) (3) of the Federal Rules of Civil Procedure but when defendants filed a motion to dismiss the class action aspect of the case, plaintiffs conceded the motion and were allowed to substitute allegations of permissive joinder under Rule 20(a) of the Federal Rules of Civil Procedure. We believe the principal question presented by this appeal may be phrased thus: Under the law of the State of Michigan, may multiple defendants, whose independent actions of allegedly discharging pollutants into the ambient air thereby allegedly create a nuisance, be jointly and severally liable to multiple plaintiffs for numerous individual injuries which plaintiffs claim to have sustained as a result of said actions, where said pollutants mix in the air so that their separate effects in creating the individual injuries are impossible to analyze. In Maddux v. Donaldson, the Michigan Supreme Court cites Landers v. East Texas Salt Water Disposal Company, a pollution case, in support of the above stated proposition. The court indicated that ". . . it is clear that there is a manifest unfairness in 'putting on the injured party the impossible burden of proving the specific shares of harm done by each. . . . Such results are simply the law's callous dullness to innocent sufferers. One would think that the obvious meanness [sic] of letting wrongdoers go scot free in such cases would cause the courts to think twice and to suspect some fallacy in their rule of law '." Plaintiffs contend that the Maddux, id, and Watts, supra, language applies here since there is no possibility of dividing the injuries herein alleged to have occurred and that it is impossible to judge which of the alleged tortfeasors caused what harm. It is the opinion of this court that the rule of Maddux, supra, and Landers, supra, cited therein is the better, and applicable rule in this air pollution case. On this point we affirm the decision of the District Judge. This complaint appears to have been filed under the diversity jurisdiction of the federal courts. All parties have agreed that Michigan law alone controls. Like most jurisdictions, Michigan has had great difficulty with the problems posed in tort cases by multiple causes for single or indivisible injuries. We believe that the issue was decided in the lengthy consideration given by the Michigan court in the Maddux case. There Justice Talbot Smith in an opinion for the court majority held: It is our conclusion that if there is competent testimony, adduced either by plaintiff or defendant, that the injuries are factually and medically separable, and that the liability for all such injuries and damages, or parts thereof, may be allocated with reasonable certainty to the impacts in turn, the jury will be instructed accordingly and mere difficulty in so doing will not relieve the triers of the facts of this responsibility. This merely follows the general rule that "where the independent concurring acts have caused distinct and separate injuries to the plaintiff, or where some reasonable means of apportioning the damages is evident, the courts generally will not hold the tort-feasors jointly and severally liable." But if, on the other hand, the triers of the facts conclude that they cannot reasonably make the division of liability between the tort-feasors, this is the point where the road of authority divides. Much ancient authority, not in truth precedent, would say that the case is now over, and that plaintiff shall take nothing. Some modern courts, as well, hold that this is merely the case of the marauding dogs and the helpless sheep relitigated in the setting of a modern highway. The conclusion is erroneous. Such precedents are not apt. When the triers of the facts decide that they cannot make a division of injuries we have, by their own finding, nothing more or less than an indivisible injury, and the precedents as to indivisible injuries will control. They were well summarized in Cooley on Torts in these words: "Where the negligence of 2 or more persons concur in producing a single, indivisible injury, then such persons are jointly and severally liable, although there was no common duty, common design, or concert action." The Maddux case has been the subject of an extensive annotation wherein the A.L.R. concludes: American decisions, statutes, and rules of court have modified and liberalized the common-law rule as to joinder of defendants, and although there is apparently no satisfactory general rule as to when various persons acting independently may be joined in a tort action, many jurisdictions evidently would now permit joinder of two or more drivers who were involved in successive collisions or accidents with a plaintiff or his vehicle. We recognize, of course, that the Maddux and Watts cases both involve multiple collisions causing allegedly indivisible injuries. Hence, appellants are free to argue that the rule stated does not necessarily apply to the nuisance category of torts with which we deal here. Indeed, appellants call our attention to what appears to be a contrary rule applicable to nuisance cases referred to in the Maddux opinion. In the latest Restatement, however, both the old and the newer rule are recognized and as the Michigan court held in Maddux, the question of whether liability of alleged polluters is joint or several is left to the trier of the facts. Where the injury itself is indivisible, the judge or jury must determine whether or not it is practicable to apportion the harm among the tortfeasors. If not, the entire liability may be imposed upon one (or several) tortfeasors subject, of course, to subsequent right of contribution among the joint offenders. Perhaps the best summary of the rationale for such a rule is found in Harper and James: In the earlier discussion of the substantive liability of joint tort-feasors and independent concurring wrongdoers who have produced indivisible harm it was indicated that there were four categories into which these parties may be placed: situations in which (1) the actors knowingly join in the performance of the tortious act or acts; (2) the actors fail to perform a common duty owed to the plaintiff; (3) there is a special relationship between the parties (e.g., master and servant or joint entrepreneurs); (4) although there is no concerted action nevertheless the independent acts of several actors concur to produce indivisible harmful consequences. * * * While the Restatement of Torts contains a short and apparently simple statement of the rule in category four, this type of situation has caused a great deal of disagreement in the courts. Here joint and several liability is sometimes imposed for the harm caused by the independent concurring acts of a number of persons. In all the situations in which such recovery is permitted the court must find first that the harm for which the plaintiff seeks damages is "indivisible." This can mean that the harm is not even theoretically divisible (as death or total destruction of a building) or that the harm, while theoretically divisible, is single in a practical sense so far as the plaintiff's ability to apportion it among the wrongdoers is concerned (as where a stream is polluted as a result of refuse from several factories). In the first type of case almost uniformly courts will permit entire recovery from any or all defendants. There is conflict, however, in the second situation, with some well-reasoned recent cases recognizing that the plaintiff's right to recover for his harm should not depend on his ability to apportion the damage but that this is a problem which is properly left with the defendants themselves. Assuming plaintiffs in this case prove injury and liability as to several tortfeasors, the net effect of Michigan's new rule is to shift the burden of proof as to which one was responsible and to what degree from the injured party to the wrongdoers. The injustice of the old rule is vividly illustrated in an early Michigan case, Frye v. City of Detroit. There a pedestrian was struck by an automobile, thrown in the path of a street car and struck again. Since his widow could not establish which impact killed him, a verdict was directed against her case. In this diversity case Michigan law is not finally and conclusively declared. The District Judge, under Erie R. Co. v. Tompkins, had to seek to establish what the Supreme Court of Michigan would do with this case on the basis of what it has already decided. Like the District Judge, we believe that the Michigan courts would apply the Maddux principles to the case at bar. Under Maddux, each plaintiff's complaint should be read as alleging $11,000 or more in damages against each defendant. Therefore, the principle of Zahn v. International Paper Co., which would disallow aggregation of plaintiffs' claims for the purpose of establishing diversity jurisdiction, does not apply to this case. As modified, the judgment of the District Court is affirmed.